. >> reporter: this is home to the u.s. national meteorite collection. some of the rocks more than four billion years old. >> so we're looking at a snapshot of the very beginnings of our solar system when we look hat this type of rock. >> reporter: the doctor says the russian meteor likely came from the asteroid belt between mars and jupiter. >> once in a while we get lucky and we get a piece of rock from mars or the moon. but in this instance we think it's most likely came from the asteroid belt. >> reporter: not the asteroid that just passed our world that close encounter was predicted. the russian meteor came out of the blue. >> this is another piece of mars. >> that is? >> this fell in egypt. >> reporter: believed to have struck and killed a dog in 1911. this photo of a meteorite crater in arizona one of the largest impacts on the planet. and this is the so-called warton meteorite. it crashed through a doctor's office in northern virginia in january 2010. >> and this is the ceiling tile above the exam room where the meteorite actually landed. >> repo